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-4x^2+x+168=0
a = -4; b = 1; c = +168;
Δ = b2-4ac
Δ = 12-4·(-4)·168
Δ = 2689
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(1)-\sqrt{2689}}{2*-4}=\frac{-1-\sqrt{2689}}{-8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{2689}}{2*-4}=\frac{-1+\sqrt{2689}}{-8} $
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